Seems like it's based on availability; so if they have empty rooms that night anyways, this site has access to those rooms. You can watch this weeks episode of shark tank. Altho they didn't explain themselves very well which ended without a deal
So like I said, it's just another way to market available inventory. Wonder what happens if you stay the night, hotel's systems might not be programmed for this kind of rate.
Not surprised they couldn't explain themselves, doesn't seem so thought out to me.
Its a cool idea for a mid day vacation
Might attract the wrong audience.